The unit that should be in the denominator of the conversion factor is Leagues.
We are given the expression that;
0.034 leagues × = yards
This means that the output unit is in yards.
Now, the numerator of the first input unit is in leagues and as such to get the output unit of Yards, it must be multiplied by a unit that has yards as its' numerator and leagues as its' denominator.
Thus, the missing unit will be Yards/leagues. Thus, we conclude that the unit that should be in the denominator of the conversion factor is Leagues.
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